The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 02, 1994
Filed:
Oct. 27, 1992
Steven L Cook, Duncan, OK (US);
Halliburton Company, Duncan, OK (US);
Abstract
Apparatus and method for detecting the presence of extraneous magnetic fields having a predetermined weak magnitude include a transformer having an excitation winding, an output winding, and a saturable core which will saturate in a magnetic field of a predetermined saturation magnitude. The core is made of amorphous metal alloy and is shaped to cancel the electromagnetic effects of magnetic fields having flux lines which are substantially parallel with respect to the transformer. An excitation circuit is connected to the excitation winding for generating a magnetic field having an excitation magnitude of lesser magnitude than the saturation magnitude of the core. The excitation magnitude and the weak magnitude of the extraneous magnetic fields combine to create a magnetic field of greater magnitude than the saturation magnitude of the core. A detector circuit is connected to the output winding for detecting and indicating saturation of the core.